<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			*{
				margin: 0;
				padding: 0;
			}
			img {
				width: 150px;
				height: 150px;
			}
			.box{
				/* 水平居中 */
				text-align: center;
				padding-top: 30px;
				padding-bottom: 30px;
				background-color: rgb(99,134,177);
			}
			body{
				background-image: url(../images/2.jpg);
				background-repeat: no-repeat;
				background-size: cover;
			}
			
		</style>
	</head>
	<!-- style="background-image: ;" -->
	<body>
		<div class="box">
			<img src="../images/1.jpg"/>
			<img src="../images/2.jpg" />
			<img src="../images/3.jpg" />
			<img src="../images/4.jpg" />
			<img src="../images/5.jpg" />
		</div>
		<script type="text/javascript">
			window.onload = function() {
				var images = document.getElementsByTagName('img');
				for (let i = 0; i < images.length; i++) {
					images[i].onclick = function () {
						//this 代表当前正在点击的对象
						var imageSrc = this.src;
						//document.body.style.backgroundImage = 'url("images/2.jpg")'
						document.body.style.backgroundImage = 'url("'+imageSrc+'")'
					}
				}
			}
		</script>
	</body>
</html>
